Why does the code below fail to transpile when pushing a new instance of class B into an array that is typed as only accepting instances of class A?
class A {};
class B {};
const arr: A[] = [];
arr.push(new B());
Why does the code below fail to transpile when pushing a new instance of class B into an array that is typed as only accepting instances of class A?
class A {};
class B {};
const arr: A[] = [];
arr.push(new B());
When TypeScript checks for type compatibility, it relies on structural compatibility. In this case, the classes are considered structurally compatible because they share the same properties (an empty object).
To learn more about type compatibility, you can visit: https://www.typescriptlang.org/docs/handbook/type-compatibility.html
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